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Combination problem

  1. Jan 14, 2008 #1
    1. The problem statement, all variables and given/known data

    A closet has 5 pairs of shoes. The number of ways in which 4
    shoes can be chosen from it so that there will be no complete pair are?

    2. Relevant equations

    Permutation and Combination formulae

    3. The attempt at a solution

    I tried but couldn't figure it out anyway.
     
  2. jcsd
  3. Jan 14, 2008 #2

    Tom Mattson

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    It would be a lot easier for us to tell you what you did wrong, if you showed us what you did.
     
  4. Jan 18, 2008 #3
    Since you don't want to have a pair you are only left with 5 shoes to pick from. Now choose 4 from that.
     
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